Drawing a Triangle

I have a program that draws triangles however Ia mhavig trouble doing the part for case 3 a triangle that follows this example
*
**
***
****
***
**
*
I understand that I to divide the height in half. However, integer division by 2 will result in a midpoint 1 less than the actual midpoint. For example: 5 / 2 = 2 (Midpoint = 2 + 1 = 3) but I am stumped on how to code this plz help

Code:

#include<iostream>usingnamespace std;
int main()
{
        int no_lines,// height of triangle.
                width;// width of rectangle.
        short choice;
        // ADDITIONAL VARIABLES
  
        // ADD A do-while LOOP TO THE PROGRAM SO THAT THE USER CAN REPEATEDLY
        // DISPLAY THE MENU, MAKE A CHOICE, AND HAVE THE APPROPRIATE STEPS FOR
        // THAT CHOICE CARRIED OUT.
        // THE LOOP SHOULD CONTINUE ITERATING UNTIL THE USER ENTERS 3 FOR THE MENU CHOICE.
        // HAVE THE PROGRAM PRINT SEVERAL BLANK LINES AFTER EACH SHAPE IS DRAWN.
                do
                {
                // Display menu.  
                cout <<"THIS PROGRAM DRAWS TRIANGLES.\n"<< endl;
                cout <<"1. Filled Triangle"<< endl;
                cout <<"2. Filled Inverted Trianlge"<< endl;
                cout <<"3. Exit\n"<< endl;
                cin >> choice;
                // ASK, READ AND VALIDATE CHOICE WITH while LOOP.
          
                // Process choice.
                switch(choice)
                {
                           case1:// Filled Triangle
                                        // Ask, read and validate number of lines.
                                        cout <<"Enter the height for the filled triangle (2 - 25): ";
                                        cin >> no_lines;
                                        while(no_lines <2|| no_lines >25)
                                        {
                                                  cout <<"Number of lines has to be between 2 and 25.\n";
                                                  cout <<"Enter the height for the filled triangle (2 - 25): ";
                                                  cin >> no_lines;
                                        }
                                        cout << endl;
// Draw shape.
// An example of a filled triangle with height 5
//                                              *
//                                              **
//                                              ***
//                                              ****
//                                              *****
                                        int i, j;
                                        for(i =1; i <= no_lines; i++)
                                        {
                                                for(j =1; j <= i; j++)
                                                        cout <<"*";
                                                cout << endl;
                                        }
                                        break;
                                        case2:// Inverted filled triangle
                                        cout <<"Enter the height for the triangle (2 - 25): ";
                                        cin >> no_lines;
                                        while(no_lines <2|| no_lines >25)
                                        {
                                                  cout <<"Number of lines has to be between 2 and 25.\n";
                                                  cout <<"Enter the height for the triangle (2 - 25): ";
                                                  cin >> no_lines;
                                        }
                                        cout << endl;
// ASK, READ AND VALIDATE HEIGHT.
// DRAW INVERTED TRIANGLE
// AN EXAMPLE OF AN INVERTED TRIANGLE OF HEIGHT 5
//                                              *****
//                                              ****
//                                              ***
//                                              **
//                                              *

                                         for(i = no_lines; i >=1; i--)
                                         {
                                         for(j =1; j <= i; j++)
                                         cout <<"*";
                                         cout << endl;
                                         }
                                        break;
                                        case3:
// ASK, READ AND VALIDATE HEIGHT.
// DRAW THE THIRD TRIANGLE
//                                              *
//                                              **
//                                              ***
//                                              **
//                                              *

                                        cout <<"Exiting ...\n";
                                        return0;
                                        break;
                                        }
                                        }
while(choice >=1&& choice <=3);
        system("pause");
               return0;
}
  

You cant work out how to add 1 to the result of h / 2?? Maybe this is a start, for what you are looking for - filling in the blanks should not be too hard after already accomplishing the other cases.

Code:

void DrawTriangle(int h)
{	
	int mid= (h/2) + 1;
	int len=0
	
	for (int i = 0; i < h; i++)
	{
		//calculate len here
		
		// loop to print "*" here { }
		
		cout << "\n";
	}		
}